Hi!
I found some solution for this problem. Only you need to put this code on functions.php of your active theme:
function custom_bbp_show_lead_topic( $show_lead ) {
if(!current_user_can('manage_options')){
$show_lead[] = 'true';
}
return $show_lead;
}
add_filter('bbp_show_lead_topic', 'custom_bbp_show_lead_topic' );